We report the results of a search for point-like deviations from isotropy in the arrival directions of ultra-high energy cosmic rays in the northern hemisphere. In the monocular data set collected by the High-Resolution Fly's Eye, consisting of 1525 events with energy exceeding 1018.5 eV, we find no evidence for point-like excesses. We place a 90% c.l. upper limit of 0.8 hadronic cosmic rays/km2 yr on the flux from such sources for the northern hemisphere and place tighter limits as a function of position in the sky.
|Original language||English (US)|
|Number of pages||9|
|State||Published - Jul 2007|
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Cosmic rays
- Point source